Century Therapeutics, Inc.

Note 1—Organization and description of the business

Century Therapeutics, Inc. (the “Company”) is an innovative biotechnology company developing transformative allogeneic cell therapies to create products for the treatment of both solid tumor and hematological malignancies and autoimmune diseases with significant unmet medical need. Since inception, the Company has devoted substantially all of its time and efforts to performing research and development activities, building infrastructure and raising capital. The Company is incorporated in the state of Delaware.

Principles of Consolidation

The consolidated financial statements include the consolidated financial position and consolidated results of operations of the Company and the Company’s subsidiaries, Century Therapeutics Canada ULC (“Century Canada”), Clade Therapeutics (“Clade”) and Gadeta B.V. (“Gadeta”). All intercompany balances and transactions have been eliminated in consolidation.

Liquidity

The accompanying consolidated financial statements have been prepared assuming the Company will continue as a going concern. The Company has limited operating history and its prospects are subject to risks, expenses, and uncertainties frequently encountered by companies in the biotechnology and pharmaceutical industries. These risks include, but are not limited to, the uncertainty of availability of additional financing and the uncertainty of achieving future profitability.

Since inception, the Company has incurred net losses and negative cash flows from operations. During the year ended December 31, 2025, the Company incurred a net loss of $9.6 and used $103.9 of cash from operations. Cash and cash equivalents and short and long-term investments were $117.1 at December 31, 2025. As further described in Note 18, the Company raised net proceeds of $126,700 in January, 2026. Management expects to incur additional losses in the future to fund its operations and conduct product research and preclinical and clinical development and recognizes the need to raise additional capital to fully implement its business plan. The Company believes it has adequate cash and financial resources to operate for at least the next 12 months from the date of issuance of these consolidated financial statements.

Note 2—Summary of significant accounting policies and basis of presentation

Basis of presentation

The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“US GAAP”), which contemplate the continued existence of the Company. Since commencing principal activities, the Company has been engaged primarily in research and development activities and raising capital.

Use of estimates

The preparation of consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and reported amounts of expenses during the reporting period. Estimates and assumptions are primarily made in relation to the valuations supporting stock compensation, the estimation of the incremental borrowing rate for operating leases, intangible assets acquired in business combinations, and standalone selling prices of performance obligations in collaboration agreements. If actual results differ from the Company’s estimates, or to the extent these estimates are adjusted in future periods, the Company’s results of operations could either benefit from, or be adversely affected by, any such change in estimate.

Concentration of credit risk and other risks and uncertainties

Financial instruments, which potentially subject the Company to significant concentrations of credit risk, consist of cash, cash equivalents, U.S. Treasury bills and bonds, as well as corporate bonds. Cash and cash equivalents, as well as short and long-term investments include a checking account and asset management accounts held by a limited number of financial institutions. At times, such deposits may be in excess of insured limits. As of December 31, 2025 and 2024, the Company has not experienced any losses on its deposits of cash and cash equivalents.

The Company’s future results of operations involve a number of risks and uncertainties. Factors that could affect the Company’s future operating results and cause actual results to vary materially from expectations include, but are not limited to, rapid technological change, uncertainty of market acceptance of its products, competition from substitute products and larger companies, protection of proprietary technology, strategic relationships, and dependence on key individuals.

Products developed by the Company require clearances from the U.S. Food and Drug Administration or other international regulatory agencies prior to commercial sales. There can be no assurance the Company’s future products will receive the necessary clearances. If the Company was denied clearance, clearance was delayed, or if the Company was unable to maintain clearance, it could have a material adverse impact on the Company.

Fair value of financial instruments

The Company discloses and recognizes the fair value of its assets and liabilities using a hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the reporting date. The hierarchy gives the highest priority to valuations based upon unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to valuations based upon unobservable inputs that are significant to the valuation (Level 3 measurements). The guidance establishes three levels of the fair value hierarchy as follows:

Level 1 Inputs that reflect unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date;

Level 2 Inputs other than quoted prices that are observable for the asset or liability either directly or indirectly, including inputs in markets that are not considered to be active;

Level 3 Inputs are unobservable in which there is little or no market data available, which require the reporting entity to develop its own assumptions that are unobservable.

Assets and liabilities measured at fair value are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability.

Cash and cash equivalents

Management considers all highly liquid investments of three months or less to be cash equivalents.

Restricted cash

As of December 31, 2025 and 2024, the Company had $3,158 and $2,772, respectively, in cash on deposit to secure certain lease commitments. Restricted cash is recorded separately in the Company’s consolidated balance sheets.

The following provides a reconciliation of the Company’s cash, cash equivalents, and restricted cash as reported in the consolidated balance sheets to the amounts reported in the consolidated statements of cash flows:

Investments

The Company invests in fixed maturity securities including U.S. Treasury bills and bonds as well as corporate bonds. The investments are classified as available-for-sale and reported at fair value. Unrealized gains or losses are determined by comparing the fair market value of the securities with their cost or amortized cost. Realized gains and losses on investments are recorded on the trade date and are included in the statement of operations. Unrealized gains and losses on investments are recorded in other comprehensive loss on the consolidated statements of operations and comprehensive loss. The cost of securities sold is based on the specified identification method. Investment income is recognized as earned and discounts or premiums arising from the purchase of debt securities are recognized in investment income using the interest method over the remaining term of the security. Securities with an original maturity date greater than three months that mature within one year of the balance sheet date are classified as short-term, while investments with a maturity date greater than one year are classified as long-term.

Property and equipment, net

Property and equipment are recorded at cost. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which is generally five years. Leasehold improvements are amortized over the shorter of the asset’s useful life or the remaining term of the lease. Construction in progress includes direct cost related to the construction of leasehold improvements and is stated at original cost. Such costs are not depreciated until the asset is completed and placed into service. Once the asset is placed into service, these capitalized costs will be allocated to leasehold improvements and will be depreciated over the shorter of

the asset’s useful life or the remaining term of the lease. Computer software and equipment includes implementation costs for cloud-based software and network equipment.

Expenditures for major additions and improvements are capitalized, while minor replacements, maintenance, and repairs are charged to expense as incurred. When property is retired or otherwise disposed of, the costs and accumulated depreciation are removed from the respective accounts, with any resulting gain or loss recognized concurrently.

Research and development expenses

Research and development expenses include costs directly attributable to the conduct of research and development programs, including the cost of salaries, payroll taxes, employee benefits, stock compensation, materials, supplies, rent, depreciation on and maintenance of research equipment with alternative future use, and the cost of services provided by outside contractors. All costs associated with research and development are expensed as incurred.

Clinical trial costs are a component of research and development expenses. The Company expenses costs for its clinical trial activities performed by third parties, including clinical research organizations and other service providers, as they are incurred, based upon estimates of the work completed over the life of the individual study in accordance with associated agreements. The Company uses information it receives from internal personnel and outside service providers to estimate the clinical trial costs incurred.

Stock-based compensation

Employees, consultants and members of the board of directors of the Company have received stock options and restricted stock of the Company. The Company recognizes the cost of the stock-based compensation incurred as its employees and board members vest in the awards. The Company accounts for stock-based compensation arrangements in accordance with provisions of Accounting Standards Codification (“ASC”) 718, Compensation—Stock Compensation. ASC 718 requires the recognition of compensation expense, using a fair-value based method, for costs related to all share-based payments including stock options. ASC 718 requires companies to estimate the fair value of share-based payment awards on the date of grant using an option-pricing model. The Company uses the Black-Scholes option-pricing model (“Black-Scholes”) to determine the fair value of options granted. The Company’s stock-based awards are subject to service-based vesting conditions and performance-based vesting conditions. Compensation expense related to awards to employees and directors with service-based vesting conditions is recognized on a straight-line basis based on the grant date fair value over the associated service period of the award, which is generally the vesting term. For performance-based awards, the Company reassesses at each reporting date whether achievement of the performance condition is probable and accrues compensation expense if and when achievement of the performance condition is probable.

Black-Scholes requires inputs based on certain subjective assumptions, including (i) the expected stock price volatility, (ii) the expected term of the award, (iii) the risk-free interest rate and (iv) expected dividends. The historical volatility is calculated based on a period of time commensurate with expected term assumption. The risk-free interest rate is based on U.S. Treasury securities with a maturity date commensurate with the expected term of the associated award. The expected dividend yield is assumed to bezero as the Company has never paid dividends and has no current plans to pay any dividends on its common stock. Forfeitures are recognized as they occur.

Warrants

Warrants are accounted for in accordance with applicable accounting guidance provided in ASC Topic 815, Derivatives and Hedging—Contracts in Entity’s Own Equity, as either derivative liabilities or as equity instruments depending on the specific terms of the warrant agreement. Through December 31,2025, the Company’s warrants were issued are in connection with its long-term debt and in connection with services

provided by consultants, and are equity classified on the accompanying consolidated balance sheets. Equity classified warrants are accounted for at fair value on the issuance date, using Black-Scholes, with no changes in fair value recognized after the issuance date. As further described in Note 18, the Company issued warrants in connection with a Private Placement in January, 2026.

Foreign currency translation

The reporting currency of the Company is the U.S. dollar. The functional currency of Century Canada is the Canadian dollar. The functional currency of Gadeta is the Euro. Assets and liabilities of Century Canada and Gadeta are translated into U.S. dollars based on exchange rates at the end of each reporting period. Expenses are translated at average exchange rates during the reporting period. Gains and losses arising from the translation of assets and liabilities are included as a component of accumulated other comprehensive loss or income on the Company’s consolidated balance sheets. Gains and losses resulting from foreign currency transactions are reflected within the Company’s consolidated statements of operations and comprehensive loss. The Company has not utilized any foreign currency hedging strategies to mitigate the effect of its foreign currency exposure.

Intercompany payables and receivables are considered to be long-term in nature and any change in balance due to foreign currency fluctuation is included as a component of the Company’s consolidated comprehensive loss and accumulated other comprehensive income (loss) within the Company’s consolidated balance sheets.

Basic and diluted net loss per common share

Basic net loss per common share is computed by dividing net loss applicable to common shareholders by the weighted-average number of common shares outstanding during the period. The Company computes diluted net loss per common share by dividing the net loss applicable to common shareholders by the sum of the weighted-average number of common shares outstanding during the period plus the potential dilutive effects of its warrants, restricted stock and stock options to purchase common shares, but such items are excluded if their effect is anti-dilutive. Because the impact of these items are anti-dilutive during periods of net loss, there were no differences between the Company’s basic and diluted net loss per common share for the years ended December 31, 2025 and 2024.

Early exercised options

The Company allowed certain of its employees and its consultants to exercise options granted under the 2018 Plan (Note 14) prior to vesting and prior to its IPO. The shares related to early exercised stock options are subject to the Company’s repurchase right upon termination of employment or services at the lesser of the original purchase price or fair market value at the time of repurchase. In order to vest, the holders are required to provide continued service to the Company. The early exercise by an employee or consultant of a stock option is not considered to be a substantive exercise for accounting purposes, and therefore, the payment received by the employer for the exercise price is recognized as a liability. For accounting purposes, unvested early exercised shares are not considered issued and outstanding and therefore not reflected as issued and outstanding in the accompanying consolidated balance sheets or the consolidated statements of changes in stockholders’ equity until the awards vest. The deposits received are initially recorded in deposit liability. The liabilities are reclassified to common stock and additional paid-in-capital as the repurchase right lapses. At December 31, 2025 and 2024, there was $0 and $82, respectively, recorded in deposit liability related to shares held by employees and nonemployees that were subject to repurchase.

All shares that were early exercised by the executives of the Company are considered legally issued, however, for accounting purposes, only vested shares are considered issued. Below is a reconciliation of shares issued and outstanding:

Income Taxes

We account for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been included in the financial statements. Under this method, we determine deferred tax assets and liabilities on the basis of the differences between the financial statement and tax bases of assets and liabilities by using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.

We recognize deferred tax assets to the extent that we believe that these assets are more likely than not to be realized. In making such a determination, we consider all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies, and results of recent operations. If we determine that we would be able to realize our deferred tax assets in the future in excess of their net recorded amount, we would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes.

We record uncertain tax positions in accordance with ASC 740 on the basis of a two-step process in which (1) we determine whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.

We recognize interest and penalties related to unrecognized tax benefits on the income tax expense line in the accompanying consolidated statement of operations. As of December 31, 2025, no accrued interest or penalties are included on the related tax liability line in the consolidated balance sheet.

Collaboration revenue

The Company may enter into collaboration and licensing agreements with strategic partners for research and development, manufacturing, and commercialization of its product candidates. Payments under these arrangements may include non-refundable, upfront fees; reimbursement of certain costs; customer option fees for additional goods or services; payments upon the achievement of development, regulatory, and commercial milestones; sales of product at certain agreed-upon amounts; and royalties on product sales.

The Company recognizes revenue in accordance with ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”). This standard applies to all contracts with customers. When an agreement falls under the scope of other standards, such as ASC Topic 808, Collaborative Arrangements (“ASC 808”), the Company will apply the recognition, measurement, presentation, and disclosure guidance in ASC 606 to the performance obligations in the agreements if those performance obligations are with a customer. Revenue recognized by analogizing to ASC 606 is recorded as collaboration revenue on the statements of operations.

Under ASC 606, an entity recognizes revenue when its customer obtains control of promised goods or services, in an amount that reflects the consideration which the entity expects to receive in exchange for those goods or services. In determining the appropriate amount of revenue to be recognized as it fulfills its

obligations under a collaboration agreement, the Company performs the following steps: (i) identification of the promised goods or services in the contract; (ii) determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract; (iii) measurement of the transaction price, including the constraint on variable consideration; (iv) allocation of the transaction price to the performance obligations on a relative stand-alone selling price basis; and (v) recognition of revenue when (or as) the Company satisfies each performance obligation.

As part of the accounting for these arrangements, the Company must use its judgment to determine the stand-alone selling price for each performance obligation identified in the contract for the allocation of transaction price. The estimation of the stand-alone selling price may include such estimates as forecasted revenues and costs, development timelines, discount rates, and probabilities of regulatory and commercial success. The Company also applies significant judgment when evaluating whether contractual obligations represent distinct performance obligations, allocating transaction price to performance obligations within a contract, determining when performance obligations have been met, assessing the recognition and future reversal of variable consideration and determining and applying appropriate methods of measuring progress for performance obligations satisfied over time. Amounts expected to be recognized as revenue within the 12 months following the balance sheet date are classified as current deferred revenue. Amounts not expected to be recognized as revenue within the 12 months following the balance sheet date are classified as deferred revenue, non-current.

If an arrangement is determined to contain customer options that allow the customer to acquire additional goods or services, the goods and services underlying the customer options are not considered to be performance obligations at the outset of the arrangement, as they are contingent upon option exercise. The Company evaluates the customer options for material rights or options to acquire additional goods or services for free or at a discount. If the customer options are not determined to represent a material right, no transaction price is allocated to these options and the Company will account for these options at that time they are exercised. If the customer options are determined to represent a material right, the material right is recognized as a separate performance obligation at the outset of the arrangement.

The obligations under the Company’s collaboration agreements may include research and development services to be performed by the Company for or on behalf of the customer. Amounts allocated to these performance obligations are recognized as the Company performs these obligations, and revenue is measured based on an inputs method of costs incurred to date of budgeted costs. Under certain circumstances, the Company may be reimbursed for certain expenses incurred under the research and development services.

At the inception of each arrangement that includes development milestone payments, the Company evaluates whether the milestones are considered probable of being achieved and estimates the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within the control of the Company or the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The Company evaluates factors such as the scientific, clinical, regulatory, commercial and other risks that must be overcome to achieve the particular milestone in making this assessment. There is considerable judgment involved in determining whether it is probable that a significant revenue reversal would not occur. At the end of each subsequent reporting period, the Company reevaluates the probability of achievement of all milestones subject to constraint and, if necessary, adjusts its estimate of the overall transaction price. Any such adjustments are recorded on a cumulative catch-up basis in the statements of operations in the period of adjustment.

Acquisition-Related Contingent Consideration

Acquisition-related contingent consideration consists of our future obligation owed to shareholders of Clade and Gadeta and includes contingent milestone payments, earn-out obligation, and indemnification

obligations. Acquisition-related contingent consideration was recorded on the acquisition date at the estimated fair value of the obligation, in accordance with the acquisition method of accounting. The fair value measurement is based on significant inputs that are unobservable in the market and thus represents a Level 3 fair value measurement. The fair value of the acquisition-related contingent consideration is remeasured each reporting period, with changes in fair value recorded in the consolidated statements of operations and comprehensive loss within general and administrative expense.

Business Combinations

The Company accounts for business combinations using the acquisition method of accounting in accordance with ASC 805, Business Combinations. Identifiable assets acquired and liabilities assumed are recorded at their acquisition date fair values. The excess of the fair value of purchase consideration over the fair values of the identifiable assets and liabilities is recorded as goodwill. Acquisition related costs are expensed as incurred. Upon acquisition, the accounts and results of operations are consolidated as of and subsequent to the acquisition date.

When determining the fair values of assets acquired and liabilities assumed, management makes significant estimates and assumptions, especially with respect to intangible assets. The Company utilizes commonly accepted valuation techniques, such as the income approach in establishing the fair value of intangible assets. See “Note 3 – Business combination” for additional detail.

Goodwill and Intangible Assets

Goodwill represents the excess of the purchase price over the net amount of identifiable assets acquired and liabilities assumed in a business combination measured at fair value. Goodwill is not amortized but is tested for impairment at least annually. The Company reviews goodwill for impairment annually in the fourth quarter and whenever events or changes in circumstances indicate that the fair value of a reporting unit may be less than its carrying amount “triggering events”. Triggering events may include a sustained period where the Company’s carrying value is in excess of its market capitalization or adverse changes in business climate. The Company first assesses qualitative factors to determine whether it is more likely than not that the fair value of its reporting unit is less than its carrying amount as a basis for determining whether it is necessary to perform the quantitative goodwill impairment test described in ASC Topic 350, Intangibles – Goodwill and Other. The more likely than not threshold is defined as having a likelihood of more than 50 percent. If, after assessing the totality of events or circumstances, the Company determines that it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the quantitative goodwill impairment test is unnecessary and goodwill is considered to be unimpaired. However, if based on the qualitative assessment the Company concludes that it is more likely than not that the fair value of a reporting unit is less than its carrying amount, the Company will proceed with performing the quantitative goodwill impairment test. In performing the quantitative goodwill impairment test, the Company determines the fair value of its reporting unit and compares it to its carrying value. If the fair value of the reporting unit exceeds the carrying value of the net assets assigned to that unit, goodwill is not impaired. If the carrying value of the reporting unit exceeds its fair value, the Company records an impairment loss equal to the difference. For the year ended December 31, 2024, there was$4,327 in impairment related to goodwill.

Indefinite-lived intangibles are carried at the initially recorded fair value less any recognized impairment. Indefinite-lived intangibles are tested at least annually for impairment. Impairment assessments are conducted more frequently if certain conditions exist, including a change in the competitive landscape, any internal decisions to pursue new or different technology strategies, or a significant change in the marketplace, including changes in the size of the market for the Company’s products. In performing the impairment test, the Company estimates the fair value of the indefinite-lived intangible asset and compares it to the carrying value. If the carrying value exceeds the estimated fair value, the Company records an impairment loss for the difference. For the year ended December 31, 2025, there wereno impairment charges on the Company’s indefinite-lived intangible assets. For further discussion of identified intangible assets, see “Note 3 – Business Combination”.

Recent accounting pronouncements

In November 2024, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2024-03, Income Statement-Reporting Comprehensive Income-Expense Disaggregation Disclosures (Subtopic 220-40) (“ASU 2024-03”). The ASU includes enhanced disclosure requirements, which mandate transparency in financial statements by requiring detailed disclosures of specific expenses like inventory purchases, employee compensation, depreciation, and intangible asset amortization. In January 2025, the FASB issued ASU 2025-01, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40) An Amendment of the FASB Accounting Standards Codification (“ASC”), Clarifying the Effective Date, which clarifies that public business entities are required to adopt the ASU 2024-03 guidance in annual reporting periods beginning after December 15, 2026. And interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating the impact of adopting this pronouncement on the Company’s consolidated financial statements and disclosures.

In December 2023, the FASB issued ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which focuses on the rate reconciliation and income taxes paid. ASU No. 2023-09 requires a public business entity (PBE) to disclose, on an annual basis, a tabular rate reconciliation using both percentages and currency amounts, broken out into specified categories with certain reconciling items further broken out by nature and jurisdiction to the extent those items exceed a specified threshold. In addition, all entities are required to disclose income taxes paid, net of refunds received disaggregated by federal, state/local, and foreign and by jurisdiction if the amount is at least 5% of total income tax payments, net of refunds received. For PBEs, the new standard is effective for annual periods beginning after December 15, 2024, with early adoption permitted. For entities other than PBEs, the requirements will be effective for annual periods beginning after December 15, 2025. An entity may apply the amendments in this ASU prospectively by providing the revised disclosures for the period ending December 31, 2025 and continuing to provide the pre-ASU disclosures for the prior periods, or may apply the amendments retrospectively by providing the revised disclosures for all period presented. As of December 31, 2025, the Company retrospectively adopted this new ASU and it only impacts the Company's income tax disclosures with no impact to its operations, cash flows, or financial condition.

Note 3—Business combination

On April 11, 2024, the Company acquired Clade, a privately held biotechnology company focused on discovering and delivering engineerable, off-the-shelf, scalable, and consistent stem cell-based medicines, with a focus on iPSC-derived αβ T cells. The acquisition expanded the Company’s pipeline by incorporating three additional preclinical-stage programs from Clade’s αβ iT platform spanning across cancer and autoimmune diseases. The results of Clade’s operations have been included in the consolidated financial statements since that date. A total of 3,741,646 common shares were issued to the Clade stockholders on the date of close, which were valued based on the closing price of common stock on that date.

Contingent consideration was estimated at fair value on the date of the close and consists of both additional stock consideration (“Holdback Shares”) as well as a contingent milestone payment of$10,000 (“Clade Milestone”). The Holdback Shares totaled 784,128 shares of common stock consideration that were issued and delivered to the Clade shareholders on October 15, 2025. This contingent consideration was recorded at fair value as of the closing date, based on the closing stock price on that date, adjusted for a discount for lack of marketability, and totaled$2,600. Contingent consideration also includes the Clade Milestone, which consists of one potential clinical development milestone payment of$10,000, which may be paid in cash, shares, or a combination thereof, upon the achievement of the milestone. The fair value of this contingent consideration was

estimated based on the probability of milestone achievement, and an estimated discount rate, and totaled$8,883 on the date of acquisition.

The Company recognized$895 of acquisition-related costs during the year ended December 31, 2024, which were expensed as incurred in the consolidated statement of operations. No such expenses were recorded during the twelve months ended December 31, 2025.

The following table summarizes the provisional fair values of the assets acquired and liabilities assumed at the date of the acquisition:

As of December 31, 2024, the purchase price was final and changes from the preliminary purchase price were immaterial. The purchase price was allocated to the tangible assets and identifiable intangible assets acquired and liabilities assumed based on their acquisition date estimated fair values. The identifiable intangible assets consist of IPR&D which were assigned fair values of$34,200. The fair value of the IPR&D was estimated using the multi-period excess earnings method, which the Company estimates future cash flows attributable to the technology and applies a probability of success and a discount rate of 26.9%.

These nonrecurring fair value measurements are Level 3 measurements within the fair value hierarchy.

Goodwill represents the excess of the purchase price over the net identifiable tangible and intangible assets acquired. The Company believes the goodwill related to the acquisition was attributable to the expected synergies and value of the assembled workforce as well as the collective experience of the management team with regards to its operations. The goodwill is not expected to be tax deductible.

As of December 31, 2024, given the sustained decrease of the Company’s market capitalization, the carrying value of the single, entity-wide reporting unit exceeded its fair value, and accordingly, the Company recorded a goodwill impairment charge of$4,327 to write off the goodwill balance.

Note 4—Financial instruments and fair value measurements

The following table sets forth the Company’s assets that were measured at fair value as of December 31, 2025, by level within the fair value hierarchy:

The following table sets forth the Company’s assets that were measured at fair value as of December 31, 2024, by level within the fair value hierarchy:

There wereno transfers between levels during the years ended December 31, 2025 and 2024. The Company uses the services of its investment manager, which uses widely accepted models for assumptions in valuing securities with inputs from major third-party data providers.

The Company classifies all of its investments in fixed maturity debt securities as available-for-sale and, accordingly, are carried at estimated fair value.

The amortized cost, gross unrealized gains and losses, and fair value of investments in fixed maturity securities are as follows as of December 31, 2025:

The amortized cost, gross unrealized gains and losses, and fair value of investments in fixed maturity securities are as follows as of December 31, 2024:

The following table provides the maturities of the Company’s fixed maturity available-for-sale securities:

The Company has evaluated the unrealized losses on the fixed maturity securities and determined that they are not attributable to credit risk factors. For fixed maturity securities, losses in fair value are viewed as temporary if the fixed maturity security can be held to maturity and it is reasonable to assume that the issuer will be able to service the debt, both as to principal and interest.

As of December 31, 2025 and December 31, 2024, the Company had 17 and 27 available-for-sale investment debt securities in an unrealized loss position without an allowance for credit losses, respectively. Unrealized losses on corporate debt have not been recognized into income because the issuers’ bonds are of high credit quality (rated BBB+ or higher) and the decline in fair value is largely due to market conditions and or changes in interest rates. Management does not intend to sell and it is likely that management will not be required to sell the securities prior to the anticipated recovery of their amortized cost basis. The issuers continue to make timely payments on the bonds. The fair value is expected to recover as the bond approaches maturity.

As of December 31, 2025 and December 31, 2024, accrued interest on available-for-sale investment debt securities totaling $393 and $1,254, respectively, is excluded from the estimate of credit losses and is included in prepaid expenses and other current assets.

The following is a roll forward of the components of the Company’s contingent consideration as of December 31,2025 (see Note 9 – Commitments and contingencies):

The following is a roll forward of the components of the Company’s contingent consideration as of December 31,2024:

The following table includes quantitative information about the significant unobservable inputs for the components of the Company’s contingent consideration liability as of December 31, 2024 and December 31, 2025.

Note 5—Prepaid expenses and other current assets

The following is a summary of prepaid expenses and other current assets:

Note 6—Property and equipment, net

The following is a summary of property and equipment, net:

Depreciation expense was $13,101 and $13,304 for the years ended December 31, 2025 and 2024, respectively.

Note 7—Accrued expenses and other liabilities

The following is a summary of accrued expenses:

Note 8 – Bristol-Myers Squibb Collaboration

On January 7, 2022, the Company entered into the Collaboration Agreement with Bristol-Myers Squibb to collaborate on the research, development and commercialization of iNK and iT cell programs for hematologic malignancies and solid tumors (“Collaboration Program”, and each product candidate a “Development Candidate”). The Collaboration Agreement was within the scope of ASC 808, Collaborative Arrangements as both parties were active participants in the arrangement and are exposed to significant risks and rewards. While this arrangement was in the scope of ASC 808, the Company analogizes to ASC 606 for the accounting for the Collaboration Agreement, including for the delivery of goods and services (i.e., units of account). Revenue recognized by analogizing to ASC 606 is recorded as collaboration revenue in the statements of operations.

Pursuant to the Collaboration Agreement, the Company and Bristol-Myers Squibb collaborated ontwo collaboration programs focused on acute myeloid leukemia (“AML”) and multiple myeloma (“MM”) (“Collaboration Programs”), and Bristol-Myers Squibb had the option to add up totwo additional Collaboration Programs for an additional fee. The Company was responsible for generating Development Candidates for each Collaboration Program, and Bristol-Myers Squibb had the option to elect to exclusively license the Development Candidates for pre-clinical development, clinical development and commercialization on a worldwide basis (“License Option”).

Under the terms of the Collaboration Agreement, Bristol-Myers Squibb made a non-refundable, upfront cash payment of $100,000 and agreed to pay an exercise fee upon the exercise of the License Option (“Licensed Program” and product candidates developed under a Licensed Program, “Licensed Products”). For each Licensed Program, Bristol-Myers Squibb agreed to pay up to $235,000 in milestone payments upon the first achievement of certain development and regulatory milestones and agreed to pay up to $500,000 per Licensed Product in net sales-based milestone payments.

In connection with the Collaboration Agreement, Bristol-Myers Squibb purchased 2,160,760 shares of the Company’s common stock at a price per share of $23.14, for an aggregate purchase price of $50,000. In determining the fair value of the common stock issued to Bristol-Myers Squibb, the Company considered the closing price of the common stock on the date of the transaction and included a lack of marketability discount because the shares are subject to certain restrictions. The Company determined the common stock purchase represented a premium of $7.82 per share, or $23,187 in the aggregate (“Equity Premium”), and the remaining $26,813 was recorded as issuance of common stock in stockholders’ equity.

The Company identified the following commitments under the arrangement: (i) research and development services (“R&D Services”) under each of thetwo initial Collaboration Programs and (ii) Bristol-Myers Squibb’s License Option to elect to exclusively license the Development Candidates for each of thetwo initial Collaboration Programs. The Company determined that these four commitments represented distinct performance obligations for purposes of recognizing revenue and would have recognized revenue if the Company had fulfilled such performance obligations.

The Company determined that the upfront payment and equity premium constituted the transaction price at the inception of the Collaboration Agreement. The future potential development and regulatory milestone payments were fully constrained at contract inception as the risk of significant revenue reversal related to these amounts has not yet been resolved. The achievement of the future potential milestones was not within the Company’s control and was subject to certain research and development success and therefore carried significant uncertainty.

The total transaction price of $123,187 was allocated to the performance obligations based on their estimated standalone selling price on January 7, 2022. The stand-alone selling price of the research and development services was estimated using the expected cost-plus margin approach, and the stand-alone selling price of the License Options was based on a discounted cash flow approach and considered several factors including, but not limited to, discount rate, development timeline, regulatory risks, estimated market demand, and future revenue potential using an adjusted market approach. The allocated transaction price is recognized as revenue in one of two ways:

Following an internal corporate portfolio prioritization process, Bristol-Myers Squibb notified the Company on December 12, 2024 that it would be terminating the Collaboration Agreement in its entirety without cause. The termination was effective on March 12, 2025. As a result of the notice of termination, the Company concluded that the research and development services being provided to Bristol-Myers Squibb were substantially complete as of December 31, 2024, and accordingly, the remaining transaction price allocated to that performance obligation was recorded in the fourth quarter of 2024. The remaining transaction price related to the license option rights, which represented a material right of$109,164 was recognized in the first quarter of 2025 when the option right expired upon the termination of the Collaboration Agreement. There will beno future collaboration revenues recognized under the Collaboration Agreement.

Note 9—Commitments and contingencies

From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of its business activities. The Company accrues a liability for such matters when future expenditures are probable and such expenditures can be reasonably estimated.

Distributed Bio Master Service Agreement

On July 24, 2019, the Company entered into a Master Service Agreement with Distributed Bio, Inc (“DBio”), whereby DBio will screen for protein binders that bind to specific therapeutic targets. The Company pays for such services according to a payment schedule, and if the Company brings the protein binders into the clinic for further development, DBio will receive milestone payments of up to $16,100 in total for each product as the products move through the clinical development and regulatory approval processes. No milestone payments were due since the inception of the agreement.

The Company had $0 within accounts payable as of December 31, 2025 and $65 within accrued liabilities as of December 31, 2024, in its consolidated balance sheets related to the Master Service Agreement. During the year ended December 31, 2025 and 2024, there were $0 and $65 in research and development expenses, respectively.

iCELL Inc. Sublicense Agreement

In March 2020, the Company entered into a Sublicense Agreement with iCELL Inc (“iCELL”) whereby iCELL granted the Company a license of certain patents and technology. The Company will pay iCELL royalties in the low single digits on net sales of the licensed product. In addition to the earned royalties, the Company will pay sales milestones, not to exceed $70,000, for the sales of the licensed product. iCELL is also eligible to receive payments of up to $4,250 in development and regulatory approval milestone payments. No milestones or royalties were due in 2025 or 2024.

Clade Therapeutics

In connection with the acquisition of Clade Therapeutics, (Note 3 Business combination), the Company is subject to a contingent milestone payment to the shareholders of Clade. The milestone payment is $10,000 and is payable in cash, shares of Century, or a combination thereof, at the discretion of Century.

A total of 793,687 shares (“Holdback Shares”) representing approximately 10% of the aggregate consideration, were held back at the closing of the acquisition as recourse to satisfy certain indemnification obligations of the Clade shareholders under the Merger Agreement should they arise and, subject to any forfeiture of Holdback Shares as a result of indemnification claims made prior to the 18-month anniversary of the Closing, will be issued pursuant to the terms of the Merger Agreement following the 18-month anniversary of the Closing. A total of 784,128 Holdback Shares were issued pursuant to the terms of the Merger Agreement on October 15, 2025.

In connection with the acquisition of Clade, the Company also assumed an earn-out obligation (“Gadeta Milestone”) that is contingent on a clinical development milestone of a product that incorporates Gadeta intellectual property between the acquisition date and December 21, 2032. The total payments to the shareholders of Gadeta is upon the occurrence of such an event is $20,000.

Catalent Dusseldorf GmbH

On December 12, 2022, Clade entered into a non-exclusive license agreement with Catalent Dusseldorf GmbH, or Catalent, pursuant to which Catalent granted Clade a worldwide, non-exclusive, non-transferrable, royalty-bearing license under all rights owned or controlled by Catalent to one of its GMP-grade iPSC cell lines derived from human cord blood CD34+ cells, to develop, have developed, make, have made, use, have used, sell, offer for sale, have sold, distribute, have distributed, import, have imported and otherwise exploit or have exploited cell therapy products. The license, or the Catalent License, permits the genetic modification of the licensed cell line and the development and commercialization of resulting cell therapy products for any indication. We have a right to use the Catalent License as a result of our acquisition of Clade.

Under the Catalent License, we may grant sublicenses to third parties to develop, manufacture and commercialize resulting products, but we may not sublicense the original cell line itself. Catalent retains ownership of the original cell line, and we own the modified cells and resulting products that we make from the original cell line, subject to certain restrictions and limited rights granted back to Catalent.

In consideration for the rights granted, Clade paid Catalent an upfront fee. We are also required to pay certain product-by-product milestone payments upon the achievement of certain development and regulatory milestones up to an aggregate of $20,430 million. We additionally agreed to pay royalties equal to a low single digit percentage of net sales of each product during a defined royalty term, after which royalty term the license automatically becomes fully paid-up, perpetual, irrevocable and royalty-free. We also agreed to pay

annual minimum fees during a defined period, with milestone payments and royalties paid in a calendar year creditable against the annual minimum fees payable for the same calendar year.

The agreement remains in effect until terminated and may be terminated by us for convenience upon prior written notice or by either party for material breach, subject to specified cure periods. Certain provisions, including payment obligations, indemnification obligations and confidentiality obligations, survive termination. During the years ended December 31, 2025 and 2024, no payments were made to Catalent.

Note 10—Leases

The Company has commitments under operating leases for certain facilities used in its operations. The Company maintains security deposits on certain leases in the amounts of $403 and $403 within security deposits and noncurrent assets in its consolidated balance sheets at December 31, 2025 and 2024, respectively. In September 2025, the Company executed a series of lease modifications with the same landlord that resulted in the early termination of its leases in Seattle, WA (“Seattle”) and Boston, MA (“Boston”). Concurrently, the Company entered into a new lease agreement in Watertown, MA (“Watertown”), set to begin upon the termination of the existing Boston lease. The Seattle lease is terminated on December 31, 2025, while the Boston lease is terminated on January 27, 2026, aligning with the commencement date of the new Watertown lease. As a result of the these lease modifications, the Company recorded a reduction of its right-of-use assets of $6,455 and lease liabilities totaling $7,850, which resulted in the recognition of a gain of $1,395 related to the Seattle lease which had previously been impaired.

The Company’s leases have initial lease terms ranging from 5 to 16 years. Certain lease agreements contain provisions for future rent increases. Variable lease costs generally include common area maintenance and real estate taxes.

Following the reduction in force (“RIF”) that occurred in July 2025, the Company is planning to sublease part of its Philadelphia, PA headquarters location. The Company evaluated the right-of-use asset for impairment as a result of this change in strategy and recorded an impairment charge of $6,763 during the thirst quiarter of 2025.

The following table reflects the components of lease expense:

The following table reflects supplemental balance sheet information related to leases:

The following table reflects supplement lease term and discount rate information related to leases:

The following table reflects future minimum lease payments under noncancelable leases as of December 31, 2025:

The new Watertown lease commenced on January 27, 2026 and the future minimum lease payments under that arrangement are approximately $7,229.

Note 11—Income taxes

The components of net income (loss) before income tax expense are as follows:

The components of the (benefit) provision for income taxes are as follows:

The reconciliation of the Company's statutory tax rate and effective tax rate is as follows:

The Company's effective tax rate includes the effects of state and local income taxes, net of the federal income tax benefit, which are primarily attributable to Pennsylvania, where the Company has significant business activities. Pennsylvania has higher effective tax rates compared to other jurisdictions where the Company operates, accounts for more than half of the Company's total state tax expense.

The components of the Company's deferred tax assets and liabilities are as follows:

As of December 31, 2025, the Company had $348,768 of U.S. federal net operating loss carryforwards, which have an unlimited carryforward period. As of December 31, 2025, the Company had $273,398 of state net operating loss carryforwards, that begin to expire at various dates starting 2040. As of December 31, 2025, the Company had $196,623 thousand of city net operating loss carryforwards, that begin to expire at various dates starting 2042. As of December 31, 2025, the Company had $58,695 of Netherlands net operating loss carryforwards, that have an unlimited carryforward period.

As of December 31, 2025, the Company had $21.9 million of U.S. federal research and development tax credits that begin to expire in 2040. As of December 31, 2025, the Company had $2.0 million of state research and development tax credits that begin to expire at various dates from 2036 through 2038.

The future realization of the tax benefits from existing temporary differences and tax attributes ultimately depends on the existence of sufficient taxable income. The Company assesses the realizability of its deferred tax assets at each balance sheet date. In assessing the realization of its deferred tax assets, the Company considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company considers the projected future taxable income, expected reversal of existing deferred tax liabilities, and tax planning strategies in making this assessment. After consideration of all available evidence, both positive and negative, the Company determined that it is not more likely than not that its net deferred tax assets will be realized in the foreseeable future. As a result, the Company increased its valuation allowance by $5.6 million as of December 31, 2025.

The Company does not provide for U.S. Federal, state, and applicable foreign income and withholding taxes on the financial reporting basis over the tax basis of its foreign subsidiary investment because the Company has the intentations and ability to indefinitely reinvest the undistributed earnings of its foreign subsidiaries. As a result, deferred taxes have not been recorded for the outside basis differences in its foreign subsidiary as of December 31, 2025 to the extent such differences are expected to result in future taxable income upon repatriation. The Company reviews its ability and intentions to indefinitely reinvest its foreign earnings at each balance sheet.

The future realization of the Company's net operating loss carryforwards and other tax attributes may also be limited by the change in ownership rules under the U.S. Internal Revenue Code Section 382. Under Section 382, if a corporation undergoes an ownership change (as defined), the corporation’s ability to utilize its net operating loss carryforwards and other tax attributes to offset income may be limited. The Company has not completed a study to assess whether an ownership change has occurred or whether there have been multiple ownership changes.

The Company records uncertain tax positions as liabilities in accordance with ASC 740-10 and adjusts these liabilities when judgment changes as a result of the evaluation of new information not previously available. Since there is complexity in some of these uncertainties, the ultimate resolution may result in a payment that is materially different from the current estimate of the unrecognized tax benefit liabilities. These differences will be reflected as increases or decreases to income tax expense in the period in which new information is available. The calculation and assessment of the Company's income tax exposures generally involves the uncertainties in the application of complex tax laws and regulations for federal, state, and foreign jurisdictions. A tax benefit from an uncertain tax position may be recognized when it is more likely than not that the position will be sustained upon local tax examination including resolutions of any related appeals or litigation on the basis of the technical merits.

The Company files income tax returns in the US and Netherlands which are the Company's major jurisdictions where it is subject to tax examination by local tax authorities. The Company is not currently under examination for income taxes, and is not aware of any issues under review that could result in significant payments, accruals or material deviation from its tax positions. To the extent the Company has tax attribute carryforwards, the tax years in which the attribute was generated may still be adjusted upon examination by local tax authorities to the extent utilized in a future period. The statute of limitations for the Company has expired for tax years prior to 2022.

As of December 31, 2025, the Company has not recorded an unrecognized tax benefit liability . As of December 31, 2025, the Company also has not recorded any accrued interest and/or penalties. The Company’s policy is to recognize interest and penalties related to uncertain tax positions in the provision for income taxes.

The following summarizes the Company's income taxes paid (net of refunds received) for the years presented below:

The following summarizes the jurisdictions that exceeded 5% of the Company's total income taxes paid (net of refunds) for the years presented below

Note 12—Basic and diluted net loss per common share

The Company’s potentially dilutive securities, which include RSUs, restricted stock, warrants, early exercised stock options and stock options to purchase shares of the Company’s common stock, have been excluded from the computation of dilutive net loss per share as the effect would be antidilutive. Therefore, the weighted-average number of shares of common stock outstanding used to calculate both basic and diluted net loss per share is the same. The Company excluded the following potential shares of common stock presented based on amounts outstanding at each stated period end, from the computation of diluted net loss per share for the years ended December 31, 2025 and 2024 because including them would have had an anti-dilutive effect.

Note 13—Defined contribution plan

The Company has a 401(k) Employee Savings Plan (“401(k) Plan”) that is available to all employees of the Company. The Company has elected a Safe-Harbor provision for the 401(k) Plan in which participants are always fully vested in their employer contributions. The Company matches 100% of the first 3% of

participating employee contributions and 50% of the next 2% of participating employee contributions. Contributions are made in cash. Contributions were approximately $1,006 and $1,130 for the year ended December 31, 2025 and 2024 respectively. Such contribution expense has been recognized in the consolidated statement of operations for each period.

Note 14—Stock-based compensation

On June 17, 2021, the Company adopted the Century Therapeutics, Inc. 2021 Equity Incentive Plan (the “2021 Incentive Plan”) which superseded the 2018 Incentive Plan and from that date forward all issuances of incentive awards will be governed by the 2021 Incentive Plan.

The 2021 Incentive Plan provides for the Company to sell or issue common stock or restricted common stock, restricted stock units (“RSUs”), or to grant incentive stock options or nonqualified stock options for the purchase of common stock, to employees, members of the board of directors, and consultants of the Company under terms and provisions established by the board of directors. Under the terms of the 2021 Incentive Plan, options may be granted at an exercise price not less than fair market value.

Upon adoption of the 2021 Incentive Plan, the Company was authorized to issue 5,481,735 shares of Common Stock under the 2021 Incentive Plan (which represents 5,640,711 shares of Common Stock initially available for grant under the 2021 Incentive Plan less 158,976 shares of Common Stock reserved for issuance upon the exercise of previously granted stock options that remain outstanding under the 2018 Incentive Plan). The number of shares of common stock initially reserved for issuance under the 2021 Incentive Plan shall be increased, upon approval by the board of directors, on January 1, 2022 and each January 1 thereafter, in an amount equal to the least of, (i) five percent (5%) of the outstanding common stock on the immediately preceding December 31, or (ii) such number of common stock determined by the board of directors no later than the immediately preceding December 31. For 2024, the 2021 Incentive Plan reserved shares were increased under clause (i) by 3,025,220 shares, effective as of January 1, 2024. As of December 31, 2024, there were 3,691,145 shares available for issuance under the 2021 Incentive Plan. For 2025, the 2021 Incentive Plan reserved shares were increased under clause (i) by 4,291,821 shares, effective as of January 1, 2025. As of December 31, 2025, there were 4,175,446 shares available for issuance under the 2021 Incentive Plan.

The Company’s stock-based awards are subject to service-based vesting conditions. Compensation expense related to awards to employees and directors with service-based vesting conditions is recognized on a straight-line basis based on the grant date fair value over the associated service period of the award, which is generally the vesting term. Stock awards granted typically vest over afour-year period but may be granted with different vesting terms. The Company may also issue awards with performance-based vesting conditions. For performance-based awards, the Company would reassess at each reporting date whether achievement of the performance condition is probable and accrue compensation expense if and when the achievement of the performance condition is probable. During the quarter ended September 30, 2025, the Company issued performance-based RSUs that represent a contingent right to receiveone share of the Company’s common stock. The RSUs shall vest 50% on October 1, 2026, with the remaining 50% vesting upon the earlier of: (i) October 1, 2027; and (ii) satisfaction of certain performance criteria.

The Company recognizes the costs of the stock-based payments as the employees vest in the awards.

As of December 31, 2025, the Company had reserved shares of common stock for issuance as follows:

The shares of Common Stock available under the 2021 Incentive Plan as of December 31, 2024 are as follows:

Stock Options

The following table summarizes stock option activity for the year ended December 31, 2025:

The weighted average grant date fair value of awards for options granted during the period ended December 31, 2025 was $0.42 As of December 31, 2025, there was $3,443 of total unrecognized compensation expense related to unvested stock options with time-based vesting terms, which is expected to be recognized over a weighted average period of 2.08 years. The aggregate intrinsic value of options vested and exercisable as of December 31, 2025 and 2024 is calculated based on the difference between the exercise price and the fair value of our common stock. The intrinsic value of options exercised in 2025 and 2024 was $32 and $923, respectively.

The Company estimates the fair value of its option awards to employees and directors using Black-Scholes, which requires inputs and subjective assumptions, including (i) the expected stock price volatility, (ii) the calculation of the expected term of the award, (iii) the risk-free interest rate and (iv)expected dividends. Due to the lack of substantial company-specific historical and implied volatility data of its common stock, the Company has based its estimate of expected volatility on the historical volatility of a group of similar public companies. Starting in June of 2023 the Company had sufficient historical information regarding stock trading history, and started to use the Company’s own stock volatility. The Company has never paid dividends and does not expect to in the foreseeable future. The expected term of the options granted to employees is derived from the “simplified” method as described in Staff Accounting Bulletin 107 relating to stock-based compensation. The risk-free interest rates for periods within expected term of the option are based on the U.S. Treasury securities with a maturity date commensurate with the expected term of the associated award. The Company will account for actual forfeitures as they occur.

The weighted-average assumptions used to calculate the fair value of stock options granted are as follows:

Restricted Stock Units

The following table summarizes restricted stock activity for the year ended December 31, 2025:

As of December 31, 2025, there was $3,784 of total unrecognized compensation expense related to the unvested restricted stock with time-based vesting terms, which is expected to be recognized over a weighted average period of 2.23 years.

Restricted Stock Awards

The following table summarizes restricted stock activity as of December 31, 2025:

As of December 31, 2025, there wasno unrecognized compensation expense related to the unvested restricted stock with time-based vesting terms. All restricted stock vests over afour-year period.

Stock-based compensation expense recorded under ASC 718 related to stock options granted and common stock issued under the 2021 Employee Stock Purchase Plan were allocated to research and development and general and administrative expense as follows:

Stock-based compensation expense by award type included within the condensed consolidated statements of operations is as follows:

Pursuant to certain stock purchase agreements containing vesting and other provisions, the Company has the right to repurchase unvested shares.

Early-Exercise of Unvested Equity Awards

Certain equity award holders early exercised unvested equity awards. The cash received upon early exercise of options of $0 and $82 was recorded as a deposit liability on the Company’s balance sheet as of December 31, 2025 and 2024, respectively.

Employee Stock Purchase Plan

The Employee Stock Purchase Plan was adopted by the board of directors in May 2021, a total of 564,071 shares of common stock were initially reserved for issuance under this plan, which shall be increased, upon approval of the board of directors, on January 1, 2022 and each January 1 thereafter, to the lesser of (i) on percent (1%) of the outstanding shares of common stock on the last day of the immediately preceding fiscal year, or (ii) an amount determined by the board of directors no later than the last day of the immediately preceding fiscal year. For 2022, the ESPP reserved shares were increased under the clause (i) by 550,055 shares, effective as of January 1, 2022. For 2023 and 2024, and 2025 the board waived the annual increase to the shares reserved under the ESPP. As of December 31, 2025, there were 639,745 shares available for issuance, under the ESPP.

Note 15—Related party transactions

License and Collaboration Agreements with Shareholder

The Company owns licenses and other contracts with FUJIFILM Cellular Dynamics, Inc. (“FCDI”). FCDI is a shareholder of Century. The acquired licenses and other contracts with FCDI are as follows:

FCDI Agreements

The Company owns a non-exclusive license agreement with FCDI. The license provides the Company with certain patents and know-how related to the reprogramming of human somatic cells to induce pluripotent stem cells (“iPSCs”) (“Reprogramming License Agreement”). Under this agreement, the Company is required to make certain developmental and regulatory milestone payments as well as royalty payments upon commercialization. Royalties are in the low single digits on the sale of all licensed products.

The Company also owns an exclusive license agreement with FCDI (“Differentiation Licenses Agreement”). The Differentiation Licenses Agreement provides the Company with patents and know-how related to human iPSC exclusively manufactured by FCDI.

In October 2019, the Company entered into the Collaboration Agreement with FCDI (“Collaboration Agreement”), whereby FCDI provides certain services to the Company to develop and manufacture iPSCs and immune cells derived therefrom. FCDI provides services in accordance with the approved research plan and related research budget. The initial research plan covered the period from October 2019 through March 31, 2022. In July, 2022 the Company amended the Collaboration Agreement to extend the term through September 30, 2025, and in September 2023, the Company amended the Collaboration Agreement in connection with the Autoimmune Licenses (as defined below).

In March 2021, the Company entered into a Manufacturing Agreement with FCDI, (“Manufacturing Agreement”), pursuant to which FCDI will provide certain agreed upon technology transfer, process development, analytical testing and cGMP manufacturing services to the Company.

In January 2022, the Company and FCDI entered into a letter agreement (the “Letter Agreement”), which amends the Reprogramming Licenses Agreement, Differentiation License Agreement and Manufacturing Agreement (the “FCDI Agreements”)pursuant to the Company’s Research Collaboration and License Agreement with Bristol-Myers Squibb. Pursuant to the Letter Agreement, and in consideration for amending the FCDI Agreements, the Company paid to FCDI an upfront payment of $10,000, and will pay FCDI (i) a percentage of any milestone payments received by the Company under the FCDI Collaboration Agreement in respect of achievement of development or regulatory milestones specific to Japan, and (ii) a percentage of all royalties received by the Company under the FCDI Collaboration Agreement in respect of sales of products in Japan.

In September 2023, the Company and FCDI entered into a worldwide license agreement whereby FCDI will grant non-exclusive licenses to the Company for certain patent rights and know-how related to cell differentiation and reprogramming for the development and commercialization of iPSC-derived therapies for the treatment of inflammatory and autoimmune diseases (the “Autoimmune license”). In addition, the Company and FCDI entered into an amendment to each of the Reprogramming license and the Differentiation License to expand the licenses related to the development and commercialization of IPSC-derived cancer immunotherapeutic to also include inflammatory and autoimmune diseases. Under the terms of these agreements, FCDI will be eligible to receive certain development and regulatory milestone payments as well as low single-digit royalties related to products developed in connection with such agreements. The Company recorded an upfront payment in the amount of $4,000 which was included as In-Process research and development. In addition, Century paid FCDI a $1,000 milestone fee pursuant to the Autoimmune License for filing of the IND for SLE for CNTY-101, which was also included in In-Process research and development in the consolidated statements of operations as of December 31, 2025.

During the years ended December 31, 2025 and 2024, the Company made payments of $1,954 and $5,200 and incurred research and development expenses of $886 and $0, in-process research and development expenses of $0 and $5,000 and legal fees of $58 and $200, respectively, related to the FCDI agreements. The legal fees are recorded within general and administrative expenses in the consolidated statements of operations and comprehensive loss.

Bayer Option Agreement

Bayer Health, LLC (“Bayer”), a shareholder in the Company, has the right of first refusal to acquire certain products researched and developed by the Company. Subject to certain exceptions, Bayer’s right of first refusal is exercisable with respect to up to four products and may only exercise these option rights in a non-sequential and alternating manner, and such rights are subject to additional limitations.

Note 16 – Common stock

At-The-Market

The Company has a Sales Agreement (“Sales Agreement”), with Cowen and Company, LLC (“Cowen”) to provide for the offering, issuance and sale of up to an aggregate amount of$150,000 of common stock from time to time in “at-the-market” offerings (the “ATM Program”). Shares of common stock pursuant to the ATM program were previously made pursuant to the Company’s shelf registration statement on Form S-3 (File No. 333-265975) (the “Prior Shelf”). Upon the expiration of the Prior Shelf, the Company filed a new shelf registration statement on Form S-3 (No. 333-288616) (the “New Shelf”), which became effective in January 2026. The Company intends to file a prospectus supplement to the New Shelf for the ATM Program and cannot make any sales under the ATM Program until such filing. During the year ended December 31, 2024, the Company sold 4,084,502 shares pursuant to the ATM Program for net proceeds of$17,829, after deducting commissions of$551. During the year ended December 31, 2025, the Company didnot have any sales in the ATM program.

Note 17 –Segment Reporting

Operating segments are identified as components of an enterprise for which separate discrete financial information is available for evaluation by the chief operating decision maker (“CODM”) in making decisions on how to allocate resources and assess performance. The Company views its operations and manages the business asone operating segment. The Company’s CODM is its Chief Executive Officer. The CODM uses research and development expenses, general and administrative expenses, and net loss as measures of profit or loss to assess performance and allocate resources, all of which are presented on the face of the financial statements. The CODM also uses a further breakdown of research and development expenses to assess performance and allocate resources as presented below:

Other segment expense/(income) includes in-process research and development, impairment of long-lived assets, impairment of goodwill, interest expense, interest income, other income (expense), and provision for income taxes.

Note 18 – Subsequent Events

Private Placement Offering

On January 7, 2026, the Company entered into a securities purchase agreement with certain institutional accredited investors (the “Investors”), pursuant to which the Company issued and sold to the Investors in a private placement (a) (i)92,030,595 shares (the “Shares”) of common stock, (ii) pre-funded warrants to purchase 25,360,704 shares of common stock (“Pre-Funded Warrants”) and (b) warrants to purchase 58,695,648 shares of common stock or Pre-Funded Warrants in lieu thereof (“Common Warrants”, together with the Pre-Funded Warrants, the “Warrants”) at a purchase price of $1.15 per share and accompanying Common Warrant to purchase 0.5 shares of common stock or Pre-Funded Warrant and a purchase price of $1.1499 per Pre-Funded Warrant and accompanying Common Warrant to purchase 0.5 shares of common stock or Pre-Funded Warrant (the “Private Placement”).

The Private Placement closed on January 9, 2026. The net proceeds received by the Company was approximately $126,700. The Company intends to use the net proceeds from the Private Placement to fund development of its lead product candidate, CNTY-813, and for working capital and other general corporate purposes.